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Discussion papers
https://doi.org/10.5194/acp-2018-1036
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1036
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 16 Oct 2018

Research article | 16 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Heterogeneous ice nucleation on dust particles sourced from 9 deserts worldwide – Part 2: Deposition nucleation and condensation freezing

Yvonne Boose1,a, Philipp Baloh2, Michael Plötze3, Johannes Ofner4, Hinrich Grothe2, Berko Sierau1, Ulrike Lohmann1, and Zamin A. Kanji1 Yvonne Boose et al.
  • 1Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland
  • 2Institute for Materials Chemistry, TU Wien, Vienna, Austria
  • 3Institute for Geotechnical Engineering, ETH Zürich, Zürich, Switzerland
  • 4Institute for Chemical Technologies and Analytics, TU Wien, Vienna, Austria
  • anow at: Institute of Atmospheric Physics, German Aerospace Center, Wessling, Germany

Abstract. Mineral dust particles from deserts are amongst the most common ice-nucleating particles in the atmosphere. The mineralogy of desert dust differs depending on the source region and can further fractionate during the dust emission processes. Mineralogy to a large extent explains the ice nucleation behavior of desert aerosol, but not entirely. Apart from pure mineral dust, desert aerosol particles are often mixed with small amounts of biological material or particles exhibit a coating. Aging on the ground or during atmospheric transport can deactivate nucleation sites and thus strong ice-nucleating minerals may not exhibit their full potential. In the partner paper of this work, it was shown that mineralogy determines most but not all of the ice nucleation behavior in the immersion mode found for desert dust. In this study, the influence of semi-volatile organic compounds and the presence of crystal water on the ice nucleation behavior of desert aerosol in addition to mineralogy is investigated. This work focuses on the deposition and condensation ice nucleation modes at temperatures between 238 to 242K of 18 dust samples sources from 9 deserts worldwide. Chemical imaging of the particles' surface is used to determine the cause of the observed differences in ice nucleation. It is found that while the ice nucleation ability of the majority of the dust samples is dominated by their quartz and feldspar content, in one carbonaceous sample it is mostly caused by organic matter, potentially cellulose and/or proteins. On the other hand, the ice nucleation ability of an airborne Saharan sample is found to be diminished likely by semi-volatile species covering ice nucleation active sites of the minerals. This study shows that in addition to mineralogy, other factors such as organics and crystal water content can alter the ice nucleation behavior of desert aerosol during atmospheric transport in various ways.

Yvonne Boose et al.
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Short summary
Which role non-mineral components play for the freezing behavior of atmospheric desert dust is not well known. In this study, we use chemical imaging methods to investigate this for airborne and surface-collected desert dust samples. We find that in most cases the ice nucleation behavior is determined by the dust mineralogical composition. However, volatile organic material can coat active sites and decrease the dust ice nucleation ability, while bioparticles can significantly increase it.
Which role non-mineral components play for the freezing behavior of atmospheric desert dust is...
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